Bug#956095: ghc panics when building ghc-lib-parser on armhf (raspberry)

[Ilias Tsitsimpis]

Control: tags -1 moreinfo

Hi!

On Tue, Apr 07, 2020 at 11:22AM, Andrew Maier wrote:
>    I get the following output:
> 
> 
>    2020-04-07 00:04:35.509894: [info] ghc-lib-parser> [143 of 205] Compiling PatSyn
>    2020-04-07 00:04:39.625117: [info] ghc-lib-parser> [144 of 205] Compiling Literal
>    2020-04-07 00:05:11.953843: [info] ghc-lib-parser> [145 of 205] Compiling TrieMap
>    2020-04-07 00:05:16.701428: [info] ghc-lib-parser> [146 of 205] Compiling HsLit
>    2020-04-07 00:05:17.243414: [warn] ghc-lib-parser> ghc: panic! (the 'impossible' happened)
>    2020-04-07 00:05:17.243723: [warn] ghc-lib-parser>   (GHC version 8.6.5 for arm-unknown-linux):
>    2020-04-07 00:05:17.243985: [warn] ghc-lib-parser>      idInfo 2020-04-07 00:05:17.244208: [warn] ghc-lib-parser>   p_a1om
>    2020-04-07 00:05:17.244405: [warn] ghc-lib-parser>   Call stack: 2020-04-07 00:05:17.244607: [warn] ghc-lib-parser>       CallStack
>    (from HasCallStack): 2020-04-07 00:05:17.244827: [warn] ghc-lib-parser> callStackDoc, called at compiler/utils/Outputable.hs:1160:37 in ghc:Outputable
>    2020-04-07 00:05:17.245074: [warn] ghc-lib-parser>         pprPanic, called at compiler/basicTypes/Var.hs:541:34 in ghc:Var
>    2020-04-07 00:05:17.245449: [warn] ghc-lib-parser> 
>    2020-04-07 00:05:17.245914: [warn] ghc-lib-parser> Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug
>    2020-04-07 00:05:17.246348: [warn] ghc-lib-parser> 
>    2020-04-07 00:05:18.101968: [error] 
>    --  While building package ghc-lib-parser-8.8.0.20190424 using:
>          /home/andrew/.stack/setup-exe-cache/arm-linux/Cabal-simple_mPHDZzAJ_2.4.0.1_ghc-8.6.5
>          --builddir=.stack-work/dist/arm-linux/Cabal-2.4.0.1 build
>          --ghc-options " -fdiagnostics-color=always"
>              Process exited with code: ExitFailure 1

Can you please try with the latest version of GHC available in unstable (9.4.7-1)?
The Debian package for ghc-lib-parser builds fine on armhf (see
https://buildd.debian.org/status/package.php?p=haskell-ghc-lib-parser&suite=sid),
so I believe this bug has been resolved.

Thanks,

-- 
Ilias